Punch.



B. E. BOSLBR.

PUNCH.

APPLICATION FILED JUNE 22. 1909.

Patented Oct. 8, 1912.

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n I I 1 IVITNESSES.

BENJAMIN E. BOSLER, OF JOHNSTOWN, PENNSYLVANIA.

men.

Speciflcation of Letters Patent.

Patented Oct 8, 1912.

Application filed June 22, 1909. Serial No. 508,591.

. To all whom it may concern:

Be it known that I, BENJAMIN E. BOSLER, a citizen of the United States,residing in the city of Johnstown, in the county of Cambria and State ofPennsylvania, have invented certain new and useful Improvements inPunches; and I do hereby declare the following to be a full, clear, andexact description of the invention, such as will enable others skilledin the art to which it appertains to make and use the same.

My invention relates to punches used in perforating metal and especiallyto those which form a fiat surface around the hole to provide a bearingfor a bolt-head, nut, or washer.

This type of punch is adapted for use in the manufacture of splice-barsfor railwayrails or for forming bolt-holes in any object having a curvedsurface.

The object of my invention is to provide a punch in which thehole-forming part is removable from the part which forms the flatbearing surface around the hole, both of which parts may be madeseparate from the punch-stock. This form of construction enables thesame stock to be used for different punches and also obviates thenecessity for replacing the entire punch whenever there is a flaw in butone art.

Referring to the sheet 0 drawings accompanying this specification,inwhich like characters of reference indicate like parts throughout theviews:Figure 1 is a vertical transverse section through the lower partof a punching apparatus, showing my improved punch in position. Thisfigure also shows the relative positions of the un'ch, die, splice-barand clamp for holdmg the splice-bar, at the extreme end of a stroke. ofthe punch. Fig. 2 is a vertical transverse section of a punch-stock,showing an oval punch in elevation and Fig. 3 is a bottom plan View ofthe same. Fig. 4 is a vertical transverse section of a punch-stock,showing a circular punch in elevation and Fig. 5 is a bottom plan viewof the same.

Referring now to the drawings in detail, 1 indicates the ram which isreciprocated by suitable means not shown. The punchholder 2 isadjustably mounted on the ram and secured as shown. The clamping-die 3is secured to rods 4 which pass through and above the ram. These rodsare used in opcrating the clamping-die, the mechanism not being shown.The die 5 for the punch is inserted in the die-block 6 which isadjustably mounted on the bed 7. The upper end of my improvedpunch-stock 8 is tenoned so as to fit into a corresponding mortise onthe punch-holder. The lower end of the stock is made smaller than thebody part and is threaded to fit the cap forging member 9. The capforging member and stock may be made of the same or of different degreesof hardness as desired. The lower face of the cap forging member is madesubstantially fiat and is used in forming a bearing surface around theholes made by the punch. The punch 10 abuts the lower end of thepunch-stock and is held in place by the cap forging member 9.

In punching oval holes in splice-bars it is desirable to have the longaxis of the holes parallel to the axis of the bar. In order to hold thepunch .in the proper position and prevent it from turning during use, Iprovide the tenon 11 on the punch and a corresponding mortise in thepunch-holder as shown in Figs. 1, 2 and 3'. This construction may bedispensed with in the case of circular punches, the punch and stock thenbeing of the form shown in Figs. 4 and 5.

Although I have shown and described my improvements in considerabledetail, I do not wish to be limited to the exact and specific detailsshown and described, but may use, such substitutions, modifications orequivalents thereof, as are embraced within the scope of my invention,or as pointed out in the claim.

In apparatus for punching splice-bars, a

,pair of clamping dies shaped to conform to the rail-fit portions ofsaid bars, means for holding the same firmly, a punch, a punchstock, anda s;waging-cap having a flat end In testinnon whereof I hereto efiix myof larger dlemeter than said punch sursignature In t e presence-0f twowltnesses.

roundin and clamping said punch rigidly to said gtock, the punch beingadapted to BENJAMIN BOSLER' 5 make a hole in the splice-bar and theswag- Witnesses:

ing-cap to indent and make a flat surface WM. J. FITZMAURIOE, J12,

around the punched hole. ELMER SEAVEY.

